Add integration test for creator holders endpoint returning 400 for invalid creator ID format

[Chucks1093]

Summary

The creator ID path param must be a positive integer. Non-numeric values, floats, and negative numbers should return 400 before any database query runs. An integration test should confirm this validation fires correctly.

Scope

• Call GET /creators/:id/holders with: a non-numeric string, a float, a negative number, and zero
• Assert each returns 400 with a descriptive error
• Assert a valid positive integer proceeds to the database layer

Acceptance Criteria

• Non-numeric string returns 400
• Float returns 400
• Negative number returns 400
• Zero returns 400
• Valid positive integer does not return 400 from validation

ETA: 12 hours

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Coordinate on Telegram

[BigJohn-dev]

@BigJohn-dev has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Allow me fix this ASAP

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[NEA-DEV-coder]

@NEA-DEV-coder has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi maintainer, I will like to resolve this issue. Thank you

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[ruthoreaji-123]

@ruthoreaji-123 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

hello maintainer can i please work on this issue. i have read the description and i would be sure to follow the scope. please kindly assign me. thank you

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[Georgechisom]

@Georgechisom has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello, i have reviewed this serve issue and i have got the experience and skill to solve it, kindly assign it to me

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[Oluwasuyi-Oluwatimilehin-Daniel]

@Oluwasuyi-Timilehin has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello, please assign this to me. I would get started immediately

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Congratulations, @Georgechisom! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign campaign!

@Georgechisom's PR #545 was approved and merged by @Chucks1093.

🏆 @Georgechisom: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (436 total points). Track your full progress on GrantFox.

👏 Great work, @Georgechisom! Keep contributing to accesslayerorg.

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This issue has been completed by @Georgechisom as part of the Stellar Wave Program's 6th Wave 🥳

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